I don't mind him calling Suzu (a) cutie at all. It was just too often for my tastes. It felt forced to me.In normal conversation you don't usually use the (nick/pet) name that often.
This being practically the only criticism I have just shows how good this is.
It feels naturally to me during writing but I guess that's a bit of a subjective thing. I'll keep an eye out going forward to see if I'm maybe overdoing it.